https://clojure.github.io/clojure/clojure.edn-api.html has a dead link to http://edn-format.org
Since that's generated from the source of clojure.edn, it means a source code change for core, so you should probably post on http://ask.clojure.org so it gets taken care of.
ha! I just hit upon this myself today! I was looking to read some edn, then I got curious about the spec again...!